Quick-attach automotive antenna mounting assembly

ABSTRACT

An attachment assembly, useful in quickly attaching an object to a panel, is provided with a base assembly having a shaft member extending therefrom and an expandable member having a plurality of fingers disposed on one side of the panel such that, during installation, the fingers radially outwardly expand to clamp the object to the panel. A process of mounting an object to a panel is also provided. The object is attached to the base of the attachment assembly and the shaft member is positioned in an aperture in a panel. The panel is clamped between the fingers and the base upon installation of the attachment assembly.

CROSS REFERENCE TO RELATED APPLICATIONS

This application is a continuation application of U.S. patentapplication Ser. No. 10/164,117 filed Jun. 5, 2002 entitled“Quick-Attach Automotive Antenna Mounting Assembly”, incorporated hereinby reference, which is a continuation-in-part U.S. patent applicationSer. No. 09/972,807, filed Oct. 9, 2001, entitled “Quick-Attach,Single-Sided Automotive Antenna Attachment Assembly”, now U.S. Pat. No.6,762,727, the disclosure of which is incorporated herein by reference.

STATEMENT REGARDING FEDERALLY SPONSORED RESEARCH OR DEVELOPMENT

N/A

BACKGROUND OF THE INVENTION

In many situations, it is necessary to attach a device to a panel orother support structure. One example is the attachment of an antenna,such as a Global Positioning System (GPS) antenna or cellular antenna toan automobile roof or trunk lid. When such devices are installed on anassembly line, it is important that the device can be accurately andquickly secured to the panel. It is also important that the device beself-contained, so as to eliminate the need for multiple parts ortwo-handed (or multiple person) operation to install the device.Further, it is important that the installation be as simple as possiblewith few operational steps. In some applications, there is an additionalrequirement that the device be properly oriented relative to the panel.

There are numerous known apparatus and processes to attach a device to apanel. In most of those known procedures, the use of both hands, ormultiple people, is required for the installation because the device ispositioned on one side of the panel and the fastening means is operatedfrom the opposite side of the panel. In addition, most installations ofknown devices require multiple steps, or the apparatus involves the useof many, often small parts, such as nuts, washers, bolts, screws, or thelike. These deficiencies result in a time consuming and awkwardinstallation.

SUMMARY OF THE INVENTION

The present invention provides an attachment assembly that providesquick attachment of an object, such as an automotive antenna unit, to apanel or other support surface, such as an exterior panel of a vehicle.A single worker is able to install the antenna unit or other object withone downward push from the exterior through an opening in the vehiclepanel without the need for tools. The attachment assembly also includesan anti-rotation feature to prevent rotation once installed. Theattachment assembly can only be removed from the interior, rendering theattachment assembly tamper resistant from the exterior. The attachmentassembly can also be mounted on vehicles with various panel thicknesses.

More particularly, the attachment assembly includes a base assemblyfixed to an object to be mounted to a panel. The base assembly includesa shaft member that extends through an opening in the panel. Anexpandable member on the shaft member includes a plurality of resilientmembers that abut against an interior surface of the panel. Theresilient members are compressible to pass through the opening in thepanel during installation. A retaining member retains the expandablemember on the shaft member with the resilient members in abutment withthe interior surface of the panel after installation. A spacer memberalso disposed on the shaft member biases the expandable member againstthe retaining member with a gap between the expandable member and thelower surface of the object. The gap is sized to receive the panel ofthe vehicle after the installation procedure. In this way, panels ofvarious thicknesses can be accommodated by an appropriately sized spacermember. If necessary, a final adjustment can be made to the retainingmember after installation. A keying feature is provided between theexpandable member and the base assembly to prevent rotation of theattachment assembly.

In a further embodiment, the invention provides an attachment assemblycomprising a base member having a mounting stud, a retaining capdisposed on the mounting stud, the retaining cap comprising a pluralityof retaining fingers, wherein the retaining fingers cooperate with thestud such that, upon axial movement of the retaining cap toward the basemember, the retaining fingers radially outwardly expand and applyclamping pressure against the panel.

In a preferred embodiment, a snap collar is disposed on the mountingstud near the base member, the snap collar having at least one resilientleg aligned along a longitudinal axis of the stud. The leg contacts theinterior of the panel to prevent movement of the base away from thepanel.

In yet another aspect, the invention provides a process of mounting anobject to a panel comprising the steps of attaching an object to anattachment assembly according to the invention and installing theattachment assembly to a panel.

These and other aspects of the invention will become apparent on afurther consideration of the specification, drawings and the appendedclaims.

DESCRIPTION OF THE DRAWINGS

The invention will be more fully understood from the following detaileddescription taken in conjunction with the accompanying drawings inwhich:

FIG. 1 is a side view of an automotive attachment assembly inconjunction with an antenna unit according to the present invention;

FIG. 2 is an exploded view of the attachment assembly and antenna unitof FIG. 1;

FIG. 3 is an exploded view of the attachment assembly of FIG. 1;

FIG. 4 is a side view of the attachment assembly of FIG. 1;

FIG. 5 is a cutaway plan view of a vehicle panel for use with theattachment assembly and antenna unit of FIG. 1;

FIG. 6 is an exploded view of a further embodiment of an attachmentassembly;

FIG. 7 is a side view of the attachment assembly of FIG. 6; and

FIG. 8 is a cutaway plan view of a vehicle panel for use with theattachment assembly of FIG. 6.

FIG. 9 is a sectioned elevation view of a further embodiment of anattachment assembly according to the invention;

FIG. 10 is a perspective view of the underside of the base of theattachment assembly of FIG. 9;

FIG. 11 is an isometric view of the mounting stud of the attachmentassembly of FIG. 9;

FIG. 12A is plan view of the snap collar of the attachment assembly ofFIG. 9;

FIG. 12B is a side elevation view of the snap collar of FIG. 12A;

FIG. 13A is a plan view of the retaining cap of the attachment assemblyof FIG. 9;

FIG. 13B is a side elevation view of the retaining cap of FIG. 13A; and

FIGS. 14A through 14D are a series of partial cross-sectional views ofthe attachment assembly particularly illustrating the process ofattaching an object to a panel.

DETAILED DESCRIPTION OF THE EMBODIMENTS

An antenna attachment assembly 10 according to a first embodiment of thepresent invention is illustrated more fully in FIGS. 1-5 in conjunctionwith an antenna unit 12. The attachment assembly 10 is fixed to andextends from the antenna unit 12 and extends through an opening 14 in apanel 16 of a vehicle body. The attachment assembly 10 includes anexpandable member 18 that is biased against the interior surface 20 ofthe panel 16, thereby fixing the attachment assembly 10 and antenna unit12 to the vehicle, as discussed further below.

In the illustrated embodiments, the antenna unit 12 is illustrated as aradome cover 22 for a GPS or satellite antenna. It will be appreciatedthat the attachment assembly of the present invention may be used withany type of antenna and associated cover or base unit, such as an AM/FMantenna, or with any other device or object that is intended to beaffixed to a panel.

In the illustrated embodiment, the unit 12 has a lower surface 24 thatis supported on the exterior surface 26 of the vehicle panel 16 over theopening 14 in the panel. A cable 28 from the unit 12 extends through thelower surface 24 of the unit and through the opening 14 in the panel 16for connection to other components within the vehicle, as known in theart. A perimeter gasket 30 with an opening 32 therein fits between thelower surface 24 of the unit 12 and the exterior surface 26 of the panel16. The gasket 30 seals the opening 14 against leaks and compensates forthickness and contour fluctuations in the panel 16. Keying features 34extend from the unit 12 and the gasket 30 into a smaller opening 36 inthe panel 16, as known in the art.

In a first embodiment, the attachment assembly 10 includes a baseassembly 40 that is fixed to and extends from the lower surface 24 ofthe antenna unit 12. The base assembly 40 includes a base plate 42having a plurality of radially extending tabs 44 located about thecircumference of the base plate. The tabs fit within the opening 14 inthe panel 16. Three tabs 44 are suitable, although any desired numbermay be used. The base assembly 40 may be integral with or fixed to theunit 12 in any suitable manner, such as with screws or adhesive. Thebase assembly 40 also includes an externally threaded hollow shaft 46extending downwardly from the base plate 42. The shaft includes one ormore key slots 48 along its length, discussed further below. The cable28 from the unit 12 passes through the hollow interior 50 of the shaft46.

When installed on a vehicle, the base assembly 40 extends through theopening 14 in the panel 16. The expandable member 18, such as a snapring, fits over the externally threaded shaft 46. A retaining member 54,such as an internally threaded jam nut, retains the expandable member 18on the base assembly and biases the expandable member against theinterior surface 20 of the panel 16. The nut preferably includes aself-locking fastener element 58, such as a polyester or nylon element,applied to the threads at an interior location to prevent slippage, asknown in the art. The fastener element should not impede engagement ofthe nut onto the threads of the shaft.

In the embodiment shown, the snap ring comprises an annular washerportion 60 and a plurality of upstanding, resilient members such asfingers 62 that, in the installed position, expand radially outwardlyand at their tips 64 press against the interior surface 20 of the panel16. The snap ring is preferably stamped and formed from a sheet materialhaving a thickness, hardness, and other properties selected to providean appropriate amount of resiliency to the fingers, as may be readilydetermined by those of skill in the art. A metal material, such as a 30gage stainless steel, is suitable, although an appropriate plastic orcomposite material may be used if desired. Preferably, a stabilitywasher 66 is provided above and an anti-torsion washer 68 is providedbelow the annular washer portion 60 to stiffen and support the washerportion and protect the washer portion from distortion. Generally, thewashers are stamped from a thicker sheet material than the snap ring,such as a 20 gage stainless steel. Both washers and the snap ringinclude one or more inwardly facing tabs or keys 70 that align with andfit within the key slots 48 on the threaded shaft 46. When fitted withinthe key slots, the keys prevent the expandable member 18 from rotatingwith respect to the unit 12.

The attachment assembly also includes a spacer member 72 such as acompression spring that allows for multiple preset distances toaccommodate various panel thicknesses. The compression spring exerts adownward bias on the snap ring against the upward force exerted by thejam nut. The height of the compression spring is set by tightening thejam nut so as to achieve the desired distance or gap (d) between the topof the snap ring fingers and the base plate. Upon installation, thevehicle panel fits within this gap. If necessary, the size of thecompression spring may be selected to achieve the desired gap size,depending on the thickness of the panel.

Assembly requires a downward push of the antenna unit 12 and theattachment assembly 10 through the opening 14 in the panel 16. As theattachment assembly is inserted through the opening in the panel, theresilient fingers 62 of the snap ring compress radially inwardly. Thetips 64 of the fingers extend within arcuate regions 74 between the tabs44 of the base plate 42. Once the snap ring passes fully through theopening 14, the fingers spread radially outwardly. The tips of thefingers, which are preferably bent inwardly, abut against the interiorsurface 20 of the panel 16, thereby locking the attachment assemblyplace. If necessary, any final adjustments can be made by rotating thejam nut.

In a further embodiment, illustrated in FIGS. 6-8, a furtheranti-rotation keying mechanism is provided. The opening 14 in the panel16 includes one or more recesses 80 spaced to provide a singleorientation. The radially extending tabs 44 on the base plate 42 arealigned with the recesses 80. The tabs fit within the recesses toprevent rotation of the assembly within the opening. Upstanding arms 82are provided on the lower anti-torsion washer to guide the attachmentassembly through the opening 14 during installation. The anti-rotationkeying mechanism may be provided in place of or in addition to thekeying features 34 utilizing the second opening 36 provided with theantenna unit 12.

A further embodiment of an attachment assembly is shown in FIGS. 9-14Din conjunction with an antenna unit 110 having a lens 112. Theattachment assembly includes a base assembly 114 including a base plate128. A shaft member or mounting stud 116 projects from the bottom of thebase plate 128. Preferably, the mounting stud 116 is formed integralwith the base plate 128. In use, the mounting stud 116 is disposed in anaperture 101 in a panel 100 (see FIGS. 14A-14D) with the base plate 128placed against the outer surface of the panel. A threaded stud 126projects from the mounting stud 116. Disposed over the mounting stud 116are an expandable member, such as a retaining cap 122, and a spacingmember, such as a snap collar 120. These elements, in combination with aretaining member, such as a nut 124 on the threaded stud 126, cooperateto secure the base assembly 114 to the panel 100, as is explained ingreater detail below.

In the embodiment shown, the plate 128 is provided with a plurality ofopenings 129. These openings facilitate attachment of the plate 128 tothe object being mounted, such as the antenna lens 112 illustrated. Thenumber, size and location of such openings are determined based on theparticular application. In some applications, such as in certainautomobile antennas, it is necessary or desirable to properly orient thedevice relative to the panel. In such circumstances, a keying featuresuch as an orientation stud 117 may be provided on the base assemblythat projects through a suitable aperture 102 in a panel 100.

A gasket 118, shown in FIGS. 9 and 14A-14D, is disposed against thebottom surface of the base plate 128. The gasket 118 seals the baseassembly 114 to the panel 100. The gasket 118 may not be required ordesirable in all applications. It is particularly desired to employ agasket in automotive applications or other applications where theexterior of the panel is exposed to the out of doors. Any suitablyshaped gasket 18 of suitable material may be employed to advantage. Whenthe attachment assembly of the invention is affixed to a panel, thegasket 118, if used, is compressed between the panel and the base plate128. Accordingly, the materials and design of the gasket 118 areselected to permit such compression to occur.

Referring FIG. 10, the base plate 128 as illustrated has an egg or ovalshape with the mounting stud 116 located in approximately the center ofthe plate 128. For clarity, the threaded stud 126 of mounting stud 116,nut 124, and retaining cap 122 are not shown in FIG. 10. The size andshape of the plate and position of the mounting stud are determined bythe intended use. It is most preferred that the plate 128 have generallythe same contours of the panel to which it is to be attached to providea smooth, tight contact between the panel and the base plate (or gasketwhere a gasket is employed) . Thus, if the base assembly were intendedto be attached to a curved panel, the base plate would be designed withthe same curvature as the curved panel. Preferably, the base assembly114 is of die cast construction, although the invention is not limitedthereto. Machined or molded constructions can also be used to advantage.

With particular attention to FIGS. 10 and 11, the mounting stud 116 is agenerally cylindrical shaped member having a centrally located bodysection 130 disposed intermediate the base 132 of the stud (that is, thepoint where the mounting stud 116 emerges from the base plate 128) andthe tip 134 of the stud 116. The body section 130 forms an annularrecess or notched area 136 at the base 132 of the stud 116, as best seenin FIG. 11. The body section 130 is tapered or flared outwardly from thetip 134 toward the base 132 of the stud 116, such that the diameter ofthe body 130 is greatest where the body section 130 joins the annularrecess 136. The tip 134 of the stud 116 is beveled or chamfered towardthe threaded stud 126. As such, the mounting stud, when viewed incross-section, has a double bevel configuration.

The mounting stud 116 is also provided with at least one boss member 138outwardly projecting from the stud 116. In a preferred embodiment, asshown in FIG. 11, the stud 116 is provided with three such boss members138 a, 138 b and 138 c, one positioned in each of three quadrants alongthe circumference of the stud 116. The remaining quadrant of the stud116 contains a notch 140 that is oriented along the longitudinal axis ofthe stud 116. The notch 140 is coextensive with a through-hole 142 inthe base plate 128. The notch 140 and through-hole 142 permit electricalwiring or coaxial cables or other necessary electromechanicalconnections to be made to the antenna or other device being attached tothe panel. Of course, if no such connections are needed, the notch 140and through hole 142 can be eliminated. Additional notches may beprovided in the body section 130 and longitudinally aligned with bosses138 a and 138 c, which are located on opposite sides of the body section130 of stud 116. See, for example, the notches 144 aligned with bosses138 a and 138 c in FIG. 9.

The snap collar 120 is shown in FIGS. 12A and 12B. The snap collar 120comprises a split ring portion 146 having a pair of resilient legs 148extending therefrom in a direction generally perpendicular to the planeof the split ring portion 146. The legs 148 are spaced approximately 180degrees from one another. Each of the legs 148 comprises a straightsection 150 and a cantilever section 152. A tab 153 extends from eachcantilever section, forming a notch surface 155 with the cantileversection. The cantilever section 152 of each leg 148 is resilientlymovable toward straight section 150 such as, for example, when the stud116 is inserted into an aperture in a panel, and then returns to itsneutral position. Cantilever sections 152 have an angular or beveledportion 154 to facilitate insertion of the cantilever sections throughan aperture in a panel. The tabs 153 remain within the aperture,preventing the cantilever sections 152 from folding outwardly anddownwardly, and the notch surface 155 catches on the edge of the panel,preventing the legs 148 from passing into the aperture, as bestillustrated in FIG. 9.

The split ring section 146 of the snap collar 120 is also provided withoutwardly oriented spacing lugs 156 that facilitate centering the stud116, and thus plate 128, in the panel aperture. The dimension A acrossthe snap collar 120 at the spacing lugs 156 is determined to closelycorrespond to the diameter of the aperture in the panel through whichthe stud 116 is to be disposed. The interior diameter B, as well asdepth C, of the split ring section 146 is determined by the size of therecess 136 in the stud 116. The distance D across the snap collar 120between cantilever sections 152 is selected to be slightly larger thanthe distance E across the stud 116 at opposing bosses 138 a, 138 c (seeFIG. 9). In a particularly preferred embodiment, the dimensions A and Eare the same.

The split ring section 146 of the snap collar 120 may be provided with anotched section 158 of reduced depth aligned with the notch 140 of stud116. The notched section 158 is particularly desired when the devicebeing mounted requires electrical wires or other connections to passthrough the panel and provides clearance for such wires or connections.

The retaining cap 122 is shown in FIGS. 13A and 13B. The retaining cap122 is preferably of stamped and formed metal construction, andcomprises a top section 160 having a central aperture 162 which is sizedto receive therein the threaded stud 126. The top section is circular inplan. A plurality of spaced apart fingers 164 are attached to the topsection 160 and extend at a generally right angle to the plane of thetop section 160 to provide the retaining cap 122 with an overall tubularappearance. In the preferred embodiment shown, four fingers 164 areprovided, equally spaced about the circumference of the top section 160,and separated by slots 165.

As best seen in FIG. 13B, the fingers 164 have an upper section 166 anda lower section 168. The upper section 166 is joined to the lowersection 168 via intermediate section 170. The intermediate section 170is outwardly angled, such that the lower portions 168 of fingers 164 areradially outwardly spaced relative to upper portions 166 and the topsection 160. The angled orientation of intermediate section 170 alsoforms a beveled shoulder 172 on the inner surface of the fingers 164.The distance X between fingers 164 disposed on opposite sides of theretaining cap 122 is selected to be slightly larger than the diameter ofthe body section 130 of stud 116, whereas the distance Y between theupper surfaces 66 of opposing fingers 164 is smaller than the diameterof the body section 130. Accordingly, when the retaining cap 122 ispositioned over stud 116, the interior of lower portions 168 of thefingers 164 will be touching, or very nearly touching the exteriorsurface of the body section 130 of the stud 116 and the beveled shoulder172 will be resting on the beveled tip 134 of the stud 116. The width ofthe slots 165 that separate the fingers 164 is sufficient to permitreceipt of the boss members 138 a-138 c of the mounting stud 116therein.

Reference is now made to FIGS. 14A-14D, which illustrate the action ofthe retaining cap. In these figures, some of the details and componentsof the invention have been omitted to simplify the illustrations. Inuse, the device being mounted to the panel 100 is attached to the baseassembly 114. The manner of attachment is not important. The snap collar120 (not shown in FIGS. 14A-14D) is positioned around the stud 116, asdescribed above. The retaining cap 122 is also positioned around thestud 116 such that the beveled shoulder 172 is resting on the beveledtip 134 and the boss members 138 a, 138 b, and 138 c are positioned inrespective slots 165 of the retaining cap 122. The nut 124 is looselythreaded onto the threaded stud 126 and, if desired, a gasket 118 isemployed.

The entire assembly is then attached to the panel 100 by inserting thestud 116 through the panel aperture 101. If present, the orientationstud 117 will be disposed through panel aperture 102. Continued movementtoward the panel 100 will cause the resilient legs 152 of the snapcollar 120 (not shown) to retract and then expand to their neutralposition once they have cleared the interior surface of the panel. Thesnap collar functions as a temporary holding mechanism while theassembly is being installed. When in the neutral position, the legs 152contact the interior surface of the panel 100 and prevent the baseassembly 114 and the device mounted thereon from moving away from thepanel 100. The retaining legs 152 do not exert any appreciable clampingforce against the panel.

From the interior of the panel 100, torque is then applied to the nut124. The nut 124 then travels toward the panel 100 along the threadedstud 126, which in turn forces the retaining cap 122 to move axiallytoward the base 114 and the panel 100. As the retaining cap 122 movestoward the base assembly 114 and the panel 100, the lower portion 168 ofthe fingers 164 will radially outwardly expand as the beveled shoulder172 contacts first the beveled tip 134 of the stud 116, and then thetapered body 130 of stud 116. The boss members 138 a-138 c prevent theretaining cap 122 from rotating relative to the stud 116 as torque isapplied to the nut 124.

The radial expansion and axial movement of fingers 164 of the retainingcap 122 toward panel 100 result in the lower portion 168 of the fingers164 contacting the inner surface of the panel 100. The snap collar 120also functions to space the retaining cap 122 a sufficient distance fromthe panel 100 such that the fingers 164 of the retaining cap cannotenter into the aperture 101. This process continues until apre-determined amount of torque has been applied and the panel 100 isfirmly clamped between the retaining cap 122 and the base member 114. Ina preferred embodiment, the boss members 138 a through 138 c of the stud116 cooperate with the slots 165 of retaining cap 122 to stop themovement of the retaining cap 122 toward panel 100, and thus prevent theapplication of too much torque, which might damage either the panel 100,the device, or both.

The internal electronics of the antenna units shown herein are notcritical to the invention, and thus they are not described in anydetail. It is, however, a feature of the invention that the baseassembly may be configured to accept such electronics or other desiredcomponents based on the intended use of the quick-attachment mountingmechanism. For example, referring to FIG. 9, the base assembly 114 maybe provided with recesses, wells, partitions, or compartments, such ascompartments 115 a and 115 b to accommodate the components of the devicebeing mounted to the panel using the invention.

It will be appreciated that other variations of the above embodimentsare possible. For example, the expandable member and the retainingmember may be formed as an integral member. The invention is not to belimited by what has been particularly shown and described, except asindicated by the appended claims.

1. A quick-attachment mounting mechanism for use in securing an antennaunit to a panel, comprising: a base, fixable to a lower surface of theantenna unit and having a stud extending therefrom; said stud having atapered body section; a retaining cap disposed on said stud for axialmovement relative thereto; said retaining cap comprising a plurality ofretaining fingers in contact with the tapered body section of said stud,wherein upon axial movement of said retaining cap toward said base theretaining fingers expand radially outward, and further comprising a snapcollar disposed about said stud, said snap collar having at least oneresilient leg positioned adjacent said base.
 2. The mechanism of claim1, wherein said snap collar comprises a snap ring portion having a pairof resilient legs extending therefrom, said legs being spaced 180°apart, each said resilient leg being disposed in a respective notch insaid tapered body section and aligned with a longitudinal axis of saidstud.
 3. A quick-attachment mounting mechanism for use in securing anantenna unit to a panel, comprising: a base, fixable to a lower surfaceof the antenna unit and having a stud extending therefrom; said studhaving a tapered body section; a retaining cap disposed on said stud foraxial movement relative thereto; said retaining cap comprising aplurality of retaining fingers in contact with the tapered body sectionof said stud, wherein upon axial movement of said retaining cap towardsaid base the retaining fingers expand radially outward, and furthercomprising a spacer member disposed about said stud between saidretaining cap and said base and sized to prevent entry of said retainingfingers of said retaining cap into an aperture in the panel.
 4. Themechanism of claim 3, wherein said spacer member comprises a snap collarhaving at least one resilient leg positioned adjacent said base.
 5. Aquick-attachment mounting mechanism for use in securing an antenna unitto a panel, comprising: a base, fixable to a lower surface of theantenna unit and having a stud extending therefrom; said stud having atapered body section; a retaining cap disposed on said stud for axialmovement relative thereto; said retaining cap comprising a plurality ofretaining fingers in contact with the tapered body section of said stud,wherein upon axial movement of said retaining cap toward said base theretaining fingers expand radially outward, and wherein said stud isprovided with a longitudinal notch aligned with a through hole in thebase.
 6. The mechanism of claim 5, further comprising a snap collardisposed about said stud, said snap collar having at least one resilientleg positioned adjacent said base and wherein the snap collar isprovided with a notched section that aligns with the longitudinal notchin the stud.
 7. A quick-attaching object for attachment to a vehiclethrough an aperture in an exterior panel of the vehicle, comprising: anobject to be attached to the exterior panel of the vehicle, the objectincluding a lower surface disposed to be supported on the exteriorsurface of the exterior panel; and an attachment assembly attached tothe lower surface of the object, comprising: a base assembly fixed tothe object, the base assembly including a shaft member extendingtherefrom; and a retaining mechanism insertable through the aperture inthe panel, the retaining mechanism comprising: an expandable membercomprising a plurality of resilient, outwardly expandable fingerscompressible to pass through the aperture in the panel, a retainingmember disposed on the shaft member to bias the expandable member towardthe panel, and a spacer member disposed on the shaft member to space theexpandable member a selected distance from the object, wherein theexpandable member comprises an annular portion, with the fingersupstanding from the annular portion, and wherein the shaft membercomprises a stud having a tapered body section, the fingers in contactwith the tapered body section.
 8. The quick-attaching assembly of claim7, wherein the expandable member comprises a retaining cap disposed foraxial movement on the shaft member.
 9. The quick-attaching object ofclaim 8, wherein the fingers of the expandable member comprise an uppersection and a lower section joined by an intermediate section, theintermediate section angled such that the lower sections of any twoopposing retaining fingers are spaced farther apart than the uppersections of said opposing fingers.
 10. The quick-attaching object ofclaim 8, wherein the expandable member comprises an annular portion, thefingers upstanding from the annular portion.
 11. The quick-attachingobject of claim 8, wherein the spacer member comprises a snap collardisposed about the shaft member, the snap collar having at least oneresilient leg position adjacent the base assembly.
 12. Thequick-attaching object of claim 11, wherein the snap collar comprises asplit ring portion having a pair of opposed resilient legs extendingtherefrom, the legs comprising a straight section and a cantileveredsection, an edge of the cantilevered section positioned adjacent thebase assembly.
 13. The quick-attaching object of claim 12, wherein thelegs further include a tab extending from the cantilevered section, thetab positioned within the aperture.
 14. The quick-attaching object ofclaim 8 wherein the retaining member comprises a nut threadably disposedon the shaft member.
 15. The quick-attaching object of claim 8, whereinthe retaining member comprises means for effecting axial movement of theexpandable member toward the panel.
 16. The quick-attaching object ofclaim 8, wherein the retaining member comprises a threaded memberattached to the shaft member and a nut threadably disposed on thethreaded member, wherein upon application of torque to the nut, theexpandable member moves toward the panel.
 17. The quick-attaching objectof claim 8, further comprising a gasket member disposed against the baseassembly.
 18. The attachment assembly of claim 17, wherein the antennaunit includes a global positioning system (GPS) antenna, or a satelliteantenna, or an AM/FM antenna.
 19. The quick-attaching object of claim 8,wherein the object is an antenna unit.
 20. The quick-attaching object ofclaim 19, wherein the antenna unit includes a global positioning system(GPS) antenna, or a satellite antenna, or an AM/FM antenna.
 21. Aquick-attachment mechanism adapted to secure an antenna unit to a panel,comprising: a base, adapted to be fixed to a lower surface of theantenna unit and having a stud extending therefrom, wherein the stud hasa tapered body section; a retaining cap disposed on the stud and adaptedto move axially relative to the stud, the retaining cap including aplurality of retaining fingers in contact with the tapered body sectionof the stud, wherein upon axial movement of the retaining cap toward thebase, the retaining fingers move along the tapered body section andcooperate therewith, whereby the tapered body section causes theretaining fingers to expand radially outward; and means for effectingaxial movement of the retaining cap, comprising a threaded memberattached to the stud and a nut, wherein upon application of torque tothe nut, the retaining cap moves toward the base.
 22. A mechanism asrecited in claim 21, further comprising a gasket positioned against asurface of the base from which the stud extends.